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How should a commercial non portable generator be grounded that has
case a - ats that switches neutral
case b - ats that doesnt switch neutral

do you have to put ground rod at generator in either case ?

Case A: Must be installed as a SDS. Bonded neutral at genset main breaker. Must have a GES connected at that point. Must have EGC on load side of genset main breaker.
Case B: Install as a non-SDS. Must NOT bond the neutral at genset. Must have EGC to genset. No GES required. You could optionally connect a GES to the the frame of the genset.

Case A: Must be installed as a SDS. Bonded neutral at genset main breaker. Must have a GES connected at that point. Must have EGC on load side of genset main breaker.
Case B: Install as a non-SDS. Must NOT bond the neutral at genset. Must have EGC to genset. No GES required. You could optionally connect a GES to the the frame of the genset.